(SQL/OLB)</para><indexterm><primary>SQL/OLB</primary></indexterm></listitem>
   <listitem><para>ISO/IEC 9075-11 Information and Definition Schemas (SQL/Schemata)</para><indexterm><primary>SQL/Schemata</primary></indexterm></listitem>
   <listitem><para>ISO/IEC 9075-13 Routines and Types using the Java Language (SQL/JRT)</para><indexterm><primary>SQL/JRT</primary></indexterm></listitem>
   <listitem><para>ISO/IEC 9075-14 XML-related specifications (SQL/XML)</para><indexterm><primary>SQL/XML</primary></indexterm></listitem>
   <listitem><para>ISO/IEC 9075-15 Multi-dimensional arrays (SQL/MDA)</para><indexterm><primary>SQL/MDA</primary></indexterm></listitem>
   <listitem><para>ISO/IEC 9075-16 Property Graph Queries (SQL/PGQ)</para><indexterm><primary>SQL/PGQ</primary></indexterm></listitem>
  </itemizedlist>

  Note that some part numbers are not (or no longer) used.
 </para>

 <para>
  The <productname>PostgreSQL</productname> core covers parts 1, 2, 9,
  11, and 14.  Part 3 is covered by the ODBC driver, and part 13 is
  covered by the PL/Java plug-in, but exact conformance is currently
  not being verified for these components.  There are currently no
  implementations of parts 4, 10, 15, and 16
  for <productname>PostgreSQL</productname>.
 </para>

 <para>
  PostgreSQL supports most of the major features of SQL:2023.  Out of
  177 mandatory features required for full Core conformance,
  PostgreSQL conforms to at least 170.  In addition, there is a long
  list of supported optional features.  It might be worth noting that at
  the time of writing, no current version of any database management
  system claims full conformance to Core SQL:2023.
 </para>

 <para>
  In the following two sections, we provide a list of those features
  that <productname>PostgreSQL</productname> supports, followed by a
  list of the features defined in <acronym>SQL:2023</acronym> which
  are not yet supported in <productname>PostgreSQL</productname>.
  Both of these lists are approximate: There might be minor details that
  are nonconforming for a feature that is listed as supported, and
  large parts of an unsupported feature might in fact be implemented.
  The main body of the documentation always contains the most accurate
  information about what does and does not work.
 </para>

 <note>
  <para>
   Feature codes containing a hyphen are subfeatures.  Therefore, if a
   particular subfeature is not supported, the main feature is listed
   as unsupported even if some other subfeatures are supported.
  </para>
 </note>

  <sect1 id="features-sql-standard">
   <title>Supported Features</title>

   <para>
    <informaltable>
     <tgroup cols="4">
      <colspec colname="col1" colwidth="1.5*"/>
      <colspec colname="col2" colwidth="1*"/>
      <colspec colname="col3" colwidth="7*"/>
      <colspec colname="col4" colwidth="3*"/>
      <thead>
       <row>
        <entry>Identifier</entry>
        <entry>Core?</entry>
        <entry>Description</entry>
        <entry>Comment</entry>
       </row>
      </thead>

      &features-supported;

     </tgroup>
    </informaltable>
   </para>
  </sect1>

  <sect1 id="unsupported-features-sql-standard">
   <title>Unsupported Features</title>

   <para>
    The following features defined in <acronym>SQL:2023</acronym> are not
    implemented in this release of
    <productname>PostgreSQL</productname>. In a few cases, equivalent
    functionality is available.

    <informaltable>
     <tgroup cols="4">
      <colspec colname="col1" colwidth="1.5*"/>
      <colspec colname="col2" colwidth="1*"/>
      <colspec colname="col3" colwidth="7*"/>
      <colspec colname="col4" colwidth="3*"/>
      <thead>
       <row>
        <entry>Identifier</entry>
        <entry>Core?</entry>
        <entry>Description</entry>
        <entry>Comment</entry>
       </row>
      </thead>

      &features-unsupported;

     </tgroup>
    </informaltable>
   </para>
  </sect1>

  <sect1 id="xml-limits-conformance">
   <title>XML Limits